Dipper-stick mounting



Jan. 8, 1929. E. J. WILSON DIPPER-SIICK MOUNTING 2 Sheets-Sheet 1 Filed June 16, 1926 E. J. WILSON DIPPER STICK MOUNTING Jan. 8, 1929.

Filed June 16, 1926 2 Sheets-Sheet 2 Patented Jan. 8, 1 929.

UNITED STATES EMERY .1. WILSON, OF CLEVELAND, OHIO, ASSIG'NOR TO THE THEW SHOVEL OF LORAIN, OHIO, A CORPORATION OF OHIO. v v

8,421 PATENT OFFICE.

COMPANY,

DEEPER-STICK MOUNTING.

Application filed June. 16,

This invention relates to a mounting for the dipper stick in the boom of a power shovel and has for itsobjects the provision of a mounting which will allow a maximum swing of the stick, and the provision in such a mounting of anti-friction but positive and structurally superior means for maintaining proper alignment of the stick throughout all of its possible operating positions.

The exact nature of the invention is described in the following specification having reference to the accompanying drawing in which Fig. 1 is a side elevation of a complete power shovel showing the positioning of the dipper stick mounting and its operative relation with the other members ofthe shovel structure; Fig. 2 is a view looking down on the boom, and showing a section of the dipper stick positioned in the mounting; Fig. 3 is an 0 enlarged section along the line 3-3 of Fig.

2 and Fig.4 is a similarly enlarged section along the line 4-4: of Fig. 1.

The principal parts of the shovel are the driving assembly, enerally indicated by'the reference numera 1, rotatably mounted upon the carriage 2, and carrying a boom 3,

which in turncarries the dipper 4 by means of the dipper stick 5 supported at its dipper end by suitable tackle; these parts and their eneral arrangement being well known in t e art. 1

My invention however, is a departure from the usual practice as to the location and arrangement of the dipper stick mounting. The boom is built up of spaced structural members which form a longitudinal opening medially of it, across whlch, through the members passes a shipper shaft 6 carrying between the members of the boom a crowd pine ion 7, and upon an over-hanging end, a

sprocket 9 whereby the pinion may be ro-' tated. The side members of the boom are symmetrical about the shipper shaft both longit-udinally and laterally, which provides a maximum strength with a minimum of weight. Owing to this central location of the shaft in the side members the top and bottom plates or web members of the boom may be considerably lengthened as the clearance required by the stick is greatly diminished.

,, The dipper stick carries a rack 8 extending throughout its length and adapted for en'- gagement with the crowd pinion whereby longitudinal motion may be imparted to the for maintaining stick regardless of its angular position with between said rack and pinion.

1926. Serial No. 116,403.

respect to the boom; suitable means, to be described, being provided formaintaining proper contact between the rack and pinion and proper alignment of the stick.

In the boom opening surrounding the shaft 3 on each side of the dipper stick and pinion 1s a generally circular surfaced casting member 10; each of these castings being secured with the boom as by a bolt 11 passing through the entire assembly, suitable inwardly ex-, tending bosses 18 upon the thus paired members 10 providing the proper clearance between the inner faces of the members to closely maintain proper alignment of the dipper stick between them and yet allow free 70 swing of the dipper stick. Other securing means, such as the bolted flanges .12tand the bolts13, may be arranged to assist the bolt 11 in maintaining the proper positioning of the members which are thus made to serve in strengthening the boom.

Inwardly of each of the members 10 and concentric with the shipper shaft therethrough is a track 14, and in-these, paired tracks is arranged to run a backing carriage for the dipper stick as follows: The carriage comprises two roller assembly units circumferentially spaced by the links 15, each of the units comprising the rollers 15- adapted to ride in the tracks 14, and a roller 16 therebetween and on a common shaft 17 therewith adapted to bear upon the back of the stick proper relation between the rack 8 and pinion 7.

The result of the arrangement described, which constitutes my invention, is an easily accessible anti-friction backing for the rack 8 in any and every position thereof; a stick positively maintained in alignment by hearing surfaces of large area; and the boom is greatly strengthened, especially at its point of maximum stress. And by the same means a much greater swing of the stick than has heretofore been possible -in the art is accomplished. I

, What I claim is:

1. In a dipper stick mounting, a dipper stick, a boom apertured to receive said stick, guide members between said stick and adjacent surfaces of said boom, a shaft passing 1 5 through said boom and members, a pinion on said shaft, a rack upon said stick in enga ement with said inion, and means carried y said members or maintaining engagement 2. In a dipper stick mounting, a dipper stick, a boom apertured to receive said stick,

circular surfaced guide members between said stick and adjacent surfaces of said boom, a shaft passin through said boom and concentric with sai members, a pinion on said shaft, a rack upon said stick in engagement with said pinion, and means carried by said members for maintaining engagement between said rack and pinion.- 7

' 3. In a dipper stick' mounting, a dipper stick, a boom apertured to receive said stick, 7 guide members between said stick and adja-.

cent surfaces of said boom, a shaft passing.

through said boom and members, a plnion on" said shaft, a rack upon said stickin engagement with said pinion, and anti-friction means carried by said members for maintaining engagement between said rack and pinion.-

4. In a dipper stick mounting, a dipperstick, a boom apertured to receive'said stick, guide members between said stick and adj acent surfaces of said boom, a shaft passing through said boom and members, a pinion on said shaft, a rack u on said stick in engage.- ment with said P1Ili0l1, and" anti-friction means carried by said membersfor maintaining engagement between said rack and -pin ion, said means including rollers mounted on tracks in said members, and rollers bacln'ng said stick a ainst said mion.

5. In a ipperstic mounting, a dipper stick, a boom apertured to receive said stick,

guide members between said stick atnd adj acent surfaces of said boom, a shaft passing through said boom and members, a pinion on said shaft, a rack upon said stick in engage- 7 In a dipper stick mounting, a dipper I 'stick, a boom apertured to receive said stick,

guide members between said stick and adj acent surfaces of said boom, and inwardly projecting bosses upon said members for maintaining clearance for said stick.

8. 'In a dipper stick mounting, a dipper stick, a boom apertured to receive said stick, guide members between sald stick and ad acent surfaces of said boom, and inwardly projecting bosses upon said members for main-- taining clearance for said stick, and arranged to be cleared by said stick during operation thereof.

In testimony whereof I hereby afiix my. signature. v

EMERY J. WILSON; 

